The crossword solution for the term 'Where a 'HOUSEBOAT' is a banana split' is DINER. A DINER is a type of restaurant that typically serves American cuisine such as hamburgers, french fries, and milkshakes. It is often characterized by its casual atmosphere and retro decor. The term 'HOUSEBOAT' is slang for a banana split, which is a popular dessert consisting of a banana cut in half lengthwise and topped with ice cream, syrup, and other toppings.